body {
  background: #fff;
}
.login_box {
  width: 400px;
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.login_box .ant-col-16 {
  max-width: 100%;
}
.login_box a {
  color: #1890ff;
}
.login_box a:hover {
  text-decoration: underline;
}
.login_box .logo {
  display: block;
  margin: 0 auto 20px;
}
.btn {
  position: absolute;
  right: 0;
  top: 0;
  z-index: 999999;
}
